Satellite first going between rings? (8)
I believe the answer is:
callisto
'satellite' is the definition.
(I've seen this before)
'first going between rings?' is the wordplay.
I cannot quite understand how this works, but
'first' could be 'ist' and 'ist' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for callisto that I've seen before include "Female reformed to bear" , "satellite" , "nymph revealing > heavenly body" , "moon of Jupiter" .)